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  1. S

    GeForce 8200 Review Surfaced

    Why? This chipset is coming out for Intel, too. It'll be a few months later than the AMD version, but pretty soon you'll be able to have it either way.
  2. S

    asus p5gdc-v deluxe: won't run ddr @ 200MHz

    It's Mushkin basic RAM. I don't think it's on the list. Do you really think Mushkin RAM and Asus boards are incompatible?
  3. S

    asus p5gdc-v deluxe: won't run ddr @ 200MHz

    I've got the Asus p5gdc-v deluxe, which supports DDR and DDR2. I'm using DDR (only). The memory is PC-3200, and the mobo supports that, but when it posts it says PC-2700. cpuz also says the memory is only running at 166MHz. I've tried letting the mobo detect the memory from SPD, and manually...
  4. S

    How do you deliver 60A to a processor?

    Okay, I didn't really think about full power planes, but that makes sense. I was doing some back of the envelope calculations with 1oz (34u) copper and I needed a trace at least a foot wide. With a thicker dedicated power plane, that would ease the requirements a little, and I suppose the...
  5. S

    How do you deliver 60A to a processor?

    I read recently that Prescott dissipates something like 90-100W, and its voltage supply is 1.4V. So that's upwards of 60A of power being delivered to the processor. That's a heck of a lot of power. A normal household circuit is designed for 15A and uses 14 gauge wire. So that's like four big...
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    Places to get information about current topics of research in computer architecture or VLSI design?

    Take a look at the IEEE Transactions on VLSI Systems. Any good engineering library should have it.
  7. S

    Dynamic beam focusing

    I'm sort of out of my depth here, so it's all just speculation. Ross, I think you're right that interactions with atoms complicates the problem. It's not because the wavelength of light is so much smaller than the wavelength of other radio frequencies. 600 nanometers is still huge compared to...
  8. S

    Dynamic beam focusing

    Yeah, exactly, the antennas would be sized on the order of a few hundred nanometers, and spaced similarly. I guess you could do it with MEMS, nanotech stuff, but that still doesn't get you the 500THz signal source and the ability to control the phase relationship between each of the antennas...
  9. S

    Dynamic beam focusing

    With an array of antennas, you can steer a beam electronically. There are radar systems that use this method, so there is no mechanical movement. In theory, since light is just another form of elecromagnetic radiation, you could do the same for light, but the frequency of visible light is in the...
  10. S

    Dynamic beam focusing

    Not sure of a way to do this electronically. Many radar systems just use a mechanically rotated dish, why couldn't you do that with your laser? Or keep the laser fixed but rotate a mirror. It's low tech, but it gets the job done.
  11. S

    Best way to find the position of a (foosball) ball?

    So you're trying to create a computer controlled goalie? Cool project. I would say 2 and 3 either won't work, or would be ridiculously complicated. 1 will likely work, but like you said, you need a high capture rate, and very low latency to work. If you can make a hardware or DSP solution...
  12. S

    the real speed of light

    You can't measure the distance to the moon and the speed of light. Since what you're actually measuring is a time, speed will depend on distance, and distance on speed. Presumably they use the known speed of light, and use the mirror to measure distance.
  13. S

    the real speed of light

    I'm not sure if it was the first, but the first accurate way of measuring c involved rotating mirrors. Rotate a mirror very fast. Shine a focused light on it (laser is best, but didn't exist when Michelson and Morley did this). Light will reflect off mirror, travel a certain distance, reflect...
  14. S

    Computer Architecture question (clock buffer?)

    In general, a buffer passes a signal unchanged, but with higher drive strength. (Drive strength relates to how much load a signal can drive). Since the clock goes to thousands of registers on a large chip, it must have a huge drive strength. The clock source (typically an on chip PLL), doesn't...
  15. S

    Question about stepdown transformers and amperage

    When I read that "the amperage is too high," what I assume he means is that the current draw of the motor is higher than the transformer can supply. Which may or may not be true, depends on the rating of the transformer. If it's too small, something will eventually give.
  16. S

    Maple help!

    What does it look like? Note that plotting sqrt(x^2+y^2) will only produce the positive cone (the one on top). If you want both cones, you'll need to plot -sqrt(x^2+y^2) as well.
  17. S

    Parallel VS serial - I don't get it

    And then I read the whole thread and realize that KalTorak said almost exactly the same thing, near the beginning. Apologies for redundancy.
  18. S

    Parallel VS serial - I don't get it

    The terminology really is at fault. We associate parallel with multiple lines and serial with single lines. So to call PCI-Express serial is misleading, because there are multiple lines. Really, modern serial means the clock is included with the data, removing the need for clock-data...
  19. S

    The Chaos theory

    Yikes, complicated question. Chaos theory came about when someone was trying to come up with a set of differential equations to model weather patterns. He noticed that when he made very minor changes to the initial conditions, the end results changed radically. As in, if I start with a...
  20. S

    with proper cooling, why can't chips be overclocked forever?

    Yeah, I think we're all right, but terminology is just getting in the way. When I said setup times decrease, I should've said the setup requirement decreases. Setup time depends on the clock period and logic propagation time, the setup requirement is a property of the flop. calbear caught me...
  21. S

    Leadtek TV Tuner Problem >>>

    I had an All-In-Wonder card that had a software setting for cable or antenna. If you chose wrong the reception was all fouled up. Maybe there's something similar.
  22. S

    with proper cooling, why can't chips be overclocked forever?

    You misunderstand me. I'm not talking about adding delay to the clock path to trade setup for hold time. I'm referring to the fact that as the logic gets faster, because of temperature or any other cause, setup times and propagation times decrease. The chip will run faster. Design depends on...
  23. S

    with proper cooling, why can't chips be overclocked forever?

    calbear2000, the setup time requirement is a direct result of the capacitance of the internal nodes of the flop. the propagation time is a direct result of the capacitance of the logic and routing wires. The other factor is the current sourcing ability of your fets. When temp goes down...
  24. S

    cycling redundancy check error or something like that!

    A cyclic redundancy error often means that the CD is bad. try cleaning it with a clean rag and try again. Try it in a different drive to see if it works. If you still have problems, send it back to the publisher to get a replacement. As for the floppy, it sounds like your drive may be going bad.
  25. S

    with proper cooling, why can't chips be overclocked forever?

    What I should've said is mobility starts to decrease again, but I assume you figured this out from the context. I don't claim to be any expert in device physics, but that's what it said in my book. "Solid State Electronic Devices", Streetman and Banerjee, 5th ed. pg. 97-98 I'll try to...
  26. S

    with proper cooling, why can't chips be overclocked forever?

    A few points: The speed of any digital system is limited by the current the transistor can supply and the capacitance being charged or discharged. More current or less capacitance = faster operation. The reason colder chips will run faster is that a transistor produces more current at lower...
  27. S

    frankensteining a UPS

    Yikes. Okay, let's see. 1. What I would do is retrofit an existing flashlight. Regardless of bulb type, without a decent reflector you won't have a good beam, and you can't make the reflector yourself. As far as bulb types go, here are my impressions. Halogen is very bright. Don't know about...
  28. S

    Was Ohm wrong?

    rjain I think it's you that has it backwards. For a given voltage, current will decrease with increasing resistance. It's important to note that Ohm's law is not an absolute. There are many materials which don't follow ohm's law. Capacitors and inductors don't follow it, their "resistance"...
  29. S

    Recording Wave Output.

    When you use sound recorder to record off of your CD-ROM, you're actually re-digitizing the analog signal. So the digital information on the CD is converted to an analog signal in the CD drive, then converted back to digital in the soundcard. So there is loss, you don't get a perfect copy (maybe...
  30. S

    Recording Wave Output.

    Let me make sure I'm clear on what you want to do. You want to record something that's playing on your PC into a wav file. i.e. you want to listen to a streaming radio station, and digitally record what you're listening to, creating a wav file. Is that what you intend? As far as I know, that...
  31. S

    Artificial Diamonds

    They could, but why? The material properties necessary for magnetic storage are very different than for semiconductors. The motivation for using them for semiconductors is, I think, superior heat conductivity and high melting point. I don't think these are really relevant for drive platters...
  32. S

    using PC as an oscilloscope

    The cheap way to do this on your own is using your sound card. A sound card has an analog input port, which can serve as an oscilloscope, and an analog output, which can serve as a function generator. If you have sound recording/editing software like soundforge, you can stare at the waveforms...
  33. S

    Gravity a "push" force?

    Let me see if I can muddy things a bit. Be very careful when you use intuition to draw physical conclusions. Physics makes no claim to being intuitive. Now, it seems like you're trying to describe the same thing in a different way. Rather than the earth and moon being pulled from the inside...
  34. S

    DC transformers

    You're right, a DC-DC converter shouldn't look like a transformer. However, one of the components of a DC-DC converter is an inductor, which I suppose could look a lot like a transformer. I'm not sure why an alarm clock would need a DC-DC converter, though, so I wouldn't assume that's what it...
  35. S

    Seebeck effect?

    I'm ignorant of the specifics, but obviously it can't be any more than 100% efficient. So you know the power output can't exceed (or reach) y watts. I would guess that there aren't theoretical limitations to approaching 100% efficiency, just engineering limitations, but, as I said, I don't...
  36. S

    EE help needed: Need to build a filter

    So if all you want to do is get rid of high frequency emissions, can't you use an RF choke? I think it's basically a magnet that you wrap the wire around, but I'm fuzzy on the details. This, I think, is done quite commonly, for that very reason. If you do want to make a filter, though...
  37. S

    why doesn't nasa...

    Shalmanese, Yes, of course you're right. It's a valid approximation most of the way up to c, but I should have been explicit. nboy 22, Beyond the danger of sending up our nuclear waste, there's the cost. We have thousands of tons of waste, and it's just too expensive to send heavy things up...
  38. S

    "Hard wired" Neural Networks?

    I don't know specifically if it's being done, but I expect it is. It wouldn't be that hard to create a neuron in hardware. A capacitor stores charge, with voltage increasing with increasing charge. A comparator could decide when enough charge has accumulated, then discharge the cap and signal...
  39. S

    why doesn't nasa...

    Jeff7, You're exactly right. 300e6 m/s divided by 10m/s^2 is 30e6 seconds. Roughly a year to top out just under light speed. Then you need another year to decelerate, also at 1G. In space there are no brakes, the only way to slow down is to turn 180 degrees and fire the rockets backwards.
  40. S

    why doesn't nasa...

    It's been done. Cassini (which went to Saturn, I believe) had a small nuclear reactor, and it was very controversial. Lots of risk assessment to figure out whether it could come back down and contaminate something. Lots of people were pretty worked up about it. I don' t think the benefit was...
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